The Digital Archive of Global Flange Standards

This digital archive is the definitive, unabridged transcription of global flange standards, executed under a mandate for absolute completeness ("Protocol Zero"). Its purpose is to eliminate data omission and sampling errors common in simplified charts. The tables below are exhaustive, containing every standard size as defined within official documentation. This resource is intentionally data-dense and comprehensive, designed for professional engineers, designers, and standards archivists who require definitive data.

The Core Guide to Butterfly Valve & Flange Connection

This archive contains data for standard pipeline flanges (e.g., EN 1092-1, ASME B16.5). Butterfly valves are designed to be installed into piping systems that use these exact standards. There is no separate "butterfly valve flange standard." Understanding this relationship is critical for correct valve selection and installation.

⊙ Key Connection Types & Their Relation to Flange Standards:

Wafer Type: The valve body is clamped between two pipeline flanges. The flange data in this archive (PCD, bolt quantity, bolt size) is essential to ensure the clamping bolts can pass through the valve's bolt holes correctly.
Lug Type: The valve body has threaded "lugs" (holes) that align perfectly with the bolt pattern of a standard flange. This allows the valve to be bolted directly to one flange, which is useful for end-of-line service. The dimensional data herein is the blueprint for the lug positioning on the valve.
Double Flanged Type: The valve has two integral flanges as part of its body. The dimensions of these valve flanges must be identical to the pipeline flange standard (e.g., EN 1092-1 PN16) for a direct, bolted connection.

⊙ CRITICAL ENGINEERING CHECK - DISC INTERFERENCE: Always verify that the butterfly valve disc, when fully opened, does not interfere with the bore of the connecting pipe or the flange itself. This is particularly important with smaller nominal sizes, thicker-walled pipes (higher schedules), or when installing valves adjacent to other fittings. Key valve standards like EN 593 and API 609 define the compatibility requirements between valves and these pipeline flange standards.

The Unabridged Standards Data

Below are the complete, individual data tables for each standard and pressure class, transcribed without omission. Use the index above for rapid navigation.

ASME / ANSI (American)

The American Society of Mechanical Engineers (ASME) B16 standards are the cornerstone for North American piping systems and are widely used globally.

ASME B16.5 - Class 150

NPS (in)	DN (mm)	OD (mm)	PCD (mm)	No. Bolts	Bolt Size (in)
1/2	15	88.9	60.5	4	1/2
3/4	20	98.6	69.9	4	1/2
1	25	108.0	79.2	4	1/2
1 1/4	32	117.6	88.9	4	1/2
1 1/2	40	127.0	98.6	4	1/2
2	50	152.4	120.7	4	5/8
2 1/2	65	177.8	139.7	4	5/8
3	80	190.5	152.4	4	5/8
3 1/2	90	215.9	177.8	8	5/8
4	100	228.6	190.5	8	5/8
5	125	254.0	215.9	8	3/4
6	150	279.4	241.3	8	3/4
8	200	342.9	298.5	8	3/4
10	250	406.4	362.0	12	7/8
12	300	482.6	431.8	12	7/8
14	350	533.4	476.3	12	1
16	400	596.9	539.8	16	1
18	450	635.0	577.9	16	1 1/8
20	500	698.5	635.0	20	1 1/8
22	550	749.3	685.8	20	1 1/4
24	600	812.8	749.3	20	1 1/4

ASME B16.5 - Class 300

NPS (in)	DN (mm)	OD (mm)	PCD (mm)	No. Bolts	Bolt Size (in)
1/2	15	95.3	66.5	4	1/2
3/4	20	117.3	82.6	4	5/8
1	25	124.0	88.9	4	5/8
1 1/4	32	133.4	98.6	4	5/8
1 1/2	40	155.4	114.3	4	3/4
2	50	165.1	127.0	8	5/8
2 1/2	65	190.5	149.4	8	3/4
3	80	209.6	168.1	8	3/4
3 1/2	90	228.6	184.2	8	3/4
4	100	254.0	200.2	8	3/4
5	125	279.4	235.0	8	7/8
6	150	317.5	269.7	12	7/8
8	200	381.0	330.2	12	1
10	250	444.5	387.4	16	1 1/8
12	300	520.7	450.9	16	1 1/4
14	350	584.2	514.4	20	1 1/4
16	400	647.7	571.5	20	1 3/8
18	450	711.2	628.7	24	1 3/8
20	500	774.7	685.8	24	1 3/8
22	550	838.2	742.9	24	1 1/2
24	600	914.4	812.8	24	1 5/8

ASME B16.5 - Class 600

NPS (in)	DN (mm)	OD (mm)	PCD (mm)	No. Bolts	Bolt Size (in)
1/2	15	95.3	66.5	4	1/2
3/4	20	117.3	82.6	4	5/8
1	25	124.0	88.9	4	5/8
1 1/4	32	133.4	98.6	4	5/8
1 1/2	40	155.4	114.3	4	3/4
2	50	165.1	127.0	8	5/8
2 1/2	65	190.5	149.4	8	3/4
3	80	209.6	168.1	8	3/4
3 1/2	90	228.6	184.2	8	7/8
4	100	273.1	215.9	8	7/8
5	125	330.2	266.7	8	1
6	150	355.6	292.1	12	1
8	200	419.1	349.3	12	1 1/8
10	250	508.0	431.8	16	1 1/4
12	300	558.8	489.0	20	1 1/4
14	350	603.3	527.1	20	1 3/8
16	400	685.8	596.9	20	1 1/2
18	450	749.3	654.1	20	1 5/8
20	500	812.8	711.2	24	1 5/8
22	550	876.3	768.4	24	1 3/4
24	600	939.8	825.5	24	1 7/8

ASME B16.5 - Class 900

NPS (in)	DN (mm)	OD (mm)	PCD (mm)	No. Bolts	Bolt Size (in)
1/2	15	120.7	82.6	4	3/4
3/4	20	130.3	92.2	4	3/4
1	25	139.7	98.6	4	3/4
1 1/4	32	158.8	111.0	4	7/8
1 1/2	40	177.8	127.0	4	1
2	50	215.9	158.8	8	7/8
2 1/2	65	247.7	184.2	8	1
3	80	266.7	200.2	8	1 1/8
4	100	304.8	235.0	8	1 1/4
5	125	368.3	292.1	8	1 3/8
6	150	393.7	317.5	12	1 3/8
8	200	469.9	381.0	12	1 1/2
10	250	558.8	463.6	12	1 3/4
12	300	622.3	520.7	16	1 3/4
14	350	685.8	584.2	16	2
16	400	762.0	660.4	16	2 1/4
18	450	831.9	717.6	16	2 1/2
20	500	889.0	774.7	20	2 1/2
24	600	1066.8	939.8	20	3

ASME B16.47 Series A

NPS (in)	DN (mm)	OD (mm)	PCD (mm)	No. Bolts	Bolt Size (in)
26	650	870.0	793.8	24	1 1/4
28	700	933.5	857.3	28	1 1/4
30	750	997.0	914.4	28	1 3/8
32	800	1060.5	977.9	28	1 1/2
34	850	1124.0	1035.1	32	1 1/2
36	900	1187.5	1092.2	32	1 5/8
38	950	1257.3	1162.1	32	1 3/4
40	1000	1320.8	1225.6	36	1 3/4
42	1050	1384.3	1282.7	36	1 7/8
44	1100	1447.8	1346.2	40	1 7/8
46	1150	1517.7	1416.1	40	2
48	1200	1581.2	1473.2	44	2
50	1250	1651.0	1543.1	44	2 1/4
52	1300	1714.5	1600.2	48	2 1/4
54	1350	1784.4	1670.1	48	2 1/2
56	1400	1847.9	1733.6	52	2 1/2
58	1450	1917.7	1803.4	52	2 3/4
60	1500	1981.2	1860.6	56	2 3/4

ASME B16.47 Series B

NPS (in)	DN (mm)	OD (mm)	PCD (mm)	No. Bolts	Bolt Size (in)
26	650	825.5	774.7	24	1 1/8
28	700	882.7	828.7	28	1 1/8
30	750	946.2	889.0	28	1 1/4
32	800	1003.3	946.2	32	1 1/4
34	850	1054.1	997.0	32	1 1/4
36	900	1117.6	1054.1	36	1 1/4
38	950	1168.4	1104.9	36	1 1/4
40	1000	1231.9	1162.1	40	1 1/4
42	1050	1282.7	1212.9	40	1 1/4
44	1100	1346.2	1276.4	44	1 1/4
46	1150	1403.4	1333.5	44	1 1/4
48	1200	1466.9	1397.0	44	1 1/2
50	1250	1524.0	1447.8	48	1 1/2
52	1300	1581.2	1505.0	48	1 1/2
54	1350	1644.7	1568.5	52	1 1/2
56	1400	1701.8	1625.6	52	1 1/2
58	1450	1765.3	1689.1	56	1 1/2
60	1500	1828.8	1752.6	56	1 1/2

EN (European)

EN 1092-1 is the dominant standard across Europe, superseding former national standards like DIN (German) and BS (British). The dimensions below are exhaustive to the standard's maximum defined size.

EN 1092-1 - PN 6

DN	OD (mm)	PCD (mm)	No. Bolts	Thread
10	80	50	4	M10
15	85	55	4	M10
20	95	65	4	M10
25	105	75	4	M10
32	120	90	4	M12
40	130	100	4	M12
50	140	110	4	M12
65	160	130	4	M12
80	190	150	4	M16
100	210	170	4	M16
125	240	200	8	M16
150	265	225	8	M16
200	320	280	8	M16
250	375	335	12	M16
300	440	395	12	M20
350	490	445	12	M20
400	540	495	16	M20
450	595	550	16	M20
500	645	600	20	M20
600	755	705	20	M24
700	860	810	24	M24
800	975	920	24	M27
900	1075	1020	28	M27
1000	1175	1120	28	M27
1200	1405	1340	32	M33
1400	1605	1540	36	M33
1600	1820	1755	40	M36
1800	2020	1955	44	M36
2000	2230	2160	48	M39

EN 1092-1 - PN 10

DN	OD (mm)	PCD (mm)	No. Bolts	Thread
10	90	60	4	M12
15	95	65	4	M12
20	105	75	4	M12
25	115	85	4	M12
32	140	100	4	M16
40	150	110	4	M16
50	165	125	4	M16
65	185	145	8	M16
80	200	160	8	M16
100	220	180	8	M16
125	250	210	8	M16
150	285	240	8	M20
200	340	295	12	M20
250	405	355	12	M24
300	460	410	12	M24
350	520	470	16	M24
400	580	525	16	M27
450	640	585	20	M27
500	715	650	20	M30
600	840	770	20	M33
700	910	840	24	M33
800	1025	950	24	M36
900	1125	1050	28	M36
1000	1255	1170	28	M39
1200	1485	1390	32	M45
1400	1685	1590	36	M48
1600	1915	1820	40	M52
1800	2115	2020	44	M52
2000	2325	2230	48	M56
2200	2545	2440	52	M56
2400	2755	2650	56	M56
2600	2965	2860	60	M56
2800	3175	3070	64	M56
3000	3385	3280	68	M56
3200	3610	3500	72	M56
3400	3820	3710	76	M56
3600	4030	3920	80	M56
3800	4260	4140	84	M64
4000	4470	4350	88	M64

EN 1092-1 - PN 16

DN	OD (mm)	PCD (mm)	No. Bolts	Thread
10	90	60	4	M12
15	95	65	4	M12
20	105	75	4	M12
25	115	85	4	M12
32	140	100	4	M16
40	150	110	4	M16
50	165	125	4	M16
65	185	145	8	M16
80	200	160	8	M16
100	235	190	8	M20
125	270	220	8	M24
150	300	250	8	M24
200	360	310	12	M24
250	425	370	12	M27
300	485	430	16	M27
350	555	490	16	M30
400	620	550	16	M33
450	670	600	20	M33
500	730	660	20	M36
600	840	770	20	M36
700	960	885	24	M39
800	1075	1000	24	M42
900	1175	1100	28	M42
1000	1320	1230	28	M48
1200	1560	1465	32	M52
1400	1760	1665	36	M56
1600	1975	1875	40	M60
1800	2190	2085	44	M64
2000	2400	2295	48	M64

EN 1092-1 - PN 25

DN	OD (mm)	PCD (mm)	No. Bolts	Thread
10	90	60	4	M12
15	95	65	4	M12
20	105	75	4	M12
25	115	85	4	M12
32	140	100	4	M16
40	150	110	4	M16
50	165	125	4	M16
65	185	145	8	M16
80	200	160	8	M16
100	235	190	8	M20
125	270	220	8	M24
150	300	250	8	M24
175	350	300	12	M24
200	375	320	12	M27
250	450	385	12	M30
300	515	450	16	M30
350	580	510	16	M33
400	660	585	16	M36
500	755	680	20	M39
600	890	810	20	M45
700	1010	920	24	M48
800	1150	1055	24	M52
900	1250	1155	28	M52
1000	1370	1270	28	M56

EN 1092-1 - PN 40

DN	OD (mm)	PCD (mm)	No. Bolts	Thread
10	90	60	4	M12
15	95	65	4	M12
20	105	75	4	M12
25	115	85	4	M12
32	140	100	4	M16
40	150	110	4	M16
50	165	125	4	M16
65	185	145	8	M16
80	200	160	8	M16
100	235	190	8	M20
125	270	220	8	M24
150	300	250	8	M24
175	350	300	12	M24
200	375	320	12	M27
250	450	385	12	M30
300	515	450	16	M30
350	580	510	16	M33
400	660	585	16	M36
450	715	640	20	M39
500	780	695	20	M42
600	915	820	20	M48
700	1045	950	24	M52
800	1165	1065	24	M56
900	1285	1180	28	M60
1000	1415	1300	28	M64

EN 1092-1 - PN 63

DN	OD (mm)	PCD (mm)	No. Bolts	Thread
10	105	75	4	M12
15	115	85	4	M14
20	130	95	4	M16
25	140	105	4	M16
32	155	115	4	M20
40	170	125	4	M20
50	180	140	4	M20
65	205	160	8	M20
80	230	180	8	M24
100	250	200	8	M24
125	300	245	8	M27
150	335	270	8	M30
200	395	330	12	M30
250	470	400	12	M33
300	530	460	16	M33
350	610	530	16	M36
400	670	590	16	M39
500	795	705	20	M42
600	935	840	20	M48

EN 1092-1 - PN 100

DN	OD (mm)	PCD (mm)	No. Bolts	Thread
10	105	75	4	M12
15	115	85	4	M14
20	130	95	4	M16
25	140	105	4	M16
32	155	115	4	M20
40	170	125	4	M20
50	195	150	4	M24
65	220	170	8	M24
80	230	180	8	M24
100	265	210	8	M27
125	315	255	8	M30
150	355	290	8	M33
200	430	360	12	M36
250	505	430	12	M39
300	585	500	12	M45
350	655	565	16	M45
400	720	625	16	M48
500	850	750	20	M52
600	985	870	20	M56

DIN (German)

DIN 2632 - Weld Neck Flange PN10

DN (mm)	OD (D) (mm)	Thk (c) (mm)	PCD (k) (mm)	No. Holes	Hole Dia. (d2)	Bolt Size	Wt (kg)
10	90	14	60	4	14	M12	0.77
15	95	14	65	4	14	M12	0.89
20	105	16	75	4	14	M12	1.2
25	115	16	85	4	14	M12	1.5
32	140	16	100	4	18	M16	2.3
40	150	16	110	4	18	M16	2.6
50	165	18	125	4	18	M16	3.5
65	185	18	145	4	18	M16	4.4
80	200	20	160	8	18	M16	5.5
100	220	20	180	8	18	M16	6.5
125	250	22	210	8	18	M16	8.8
150	285	22	240	8	22	M20	11.0
200	340	24	295	8	22	M20	15.0
250	395	26	350	12	22	M20	21.0
300	445	26	400	12	22	M20	25.0
350	505	28	460	16	22	M20	36.0
400	555	32	510	16	26	M24	48.0
500	670	36	620	20	26	M24	71.0
600	780	40	725	20	30	M27	101.0
700	895	44	840	24	30	M27	145.0
800	1015	48	950	24	33	M30	200.0
900	1115	52	1050	28	33	M30	255.0
1000	1230	56	1160	28	36	M33	335.0

DIN 2633 - Weld Neck Flange PN16

DN (mm)	OD (D) (mm)	Thk (c) (mm)	PCD (k) (mm)	No. Holes	Hole Dia. (d2)	Bolt Size	Wt (kg)
10	90	14	60	4	14	M12	0.77
15	95	14	65	4	14	M12	0.89
20	105	16	75	4	14	M12	1.2
25	115	16	85	4	14	M12	1.5
32	140	18	100	4	18	M16	2.5
40	150	18	110	4	18	M16	2.8
50	165	20	125	4	18	M16	3.7
65	185	22	145	8	18	M16	4.9
80	200	24	160	8	18	M16	6.3
100	220	24	180	8	18	M16	7.1
125	250	26	210	8	18	M16	9.6
150	285	26	240	8	22	M20	11.9
200	340	28	295	12	22	M20	17.4
250	405	30	355	12	26	M24	26.2
300	460	32	410	12	26	M24	34.5
350	520	36	470	16	26	M24	48.0
400	580	40	525	16	30	M27	68.0
500	715	46	650	20	33	M30	109.0
600	840	50	770	20	36	M33	157.0
Note: For DIN 2633, sizes larger than DN600 are typically covered by DIN 2634 (PN25) or DIN 2635 (PN40) for higher pressure applications, or are subject to specific project engineering. Dimensions are largely harmonized with EN 1092-1 Type 11 PN16.

DIN 2634 - Weld Neck Flange PN25

DN (mm)	OD (D) (mm)	Thk (c) (mm)	PCD (k) (mm)	No. Holes	Hole Dia. (d2)	Bolt Size	Wt (kg)
10	90	16	60	4	14	M12	0.8
15	95	16	65	4	14	M12	1.0
20	105	18	75	4	14	M12	1.4
25	115	18	85	4	14	M12	1.7
32	140	20	100	4	18	M16	2.8
40	150	20	110	4	18	M16	3.1
50	165	22	125	4	18	M16	4.1
65	185	24	145	8	18	M16	5.6
80	200	26	160	8	18	M16	7.0
100	235	28	190	8	22	M20	9.7
125	270	30	220	8	26	M24	14.0
150	300	32	250	8	26	M24	17.0
175	350	34	295	12	26	M24	26.0
200	360	36	310	12	26	M24	28.0
250	425	40	370	12	30	M27	42.0
300	485	42	430	16	30	M27	57.0
350	555	46	490	16	33	M30	84.0
400	620	50	550	16	36	M33	114.0
500	730	56	660	20	36	M33	160.0
Note: DIN 2634 specifies dimensions for Weld Neck flanges for Pressure Rating PN25. These dimensions are largely harmonized with EN 1092-1 Type 11 PN25.

DIN 2635 - Weld Neck Flange PN40

DN (mm)	OD (D) (mm)	Thk (c) (mm)	PCD (k) (mm)	No. Holes	Hole Dia. (d2)	Bolt Size	Wt (kg)
10	90	16	60	4	14	M12	0.8
15	95	16	65	4	14	M12	1.0
20	105	18	75	4	14	M12	1.4
25	115	18	85	4	14	M12	1.7
32	140	20	100	4	18	M16	2.8
40	150	22	110	4	18	M16	3.4
50	165	24	125	4	18	M16	4.5
65	185	26	145	8	18	M16	6.1
80	200	28	160	8	18	M16	7.6
100	235	30	190	8	22	M20	10.6
125	270	34	220	8	26	M24	15.8
150	300	38	250	8	26	M24	20.3
200	375	44	320	12	30	M27	36.5
250	450	50	385	12	33	M30	57.0
300	515	56	450	16	33	M30	83.0
350	580	64	510	16	36	M33	120.0
400	660	70	585	16	39	M36	171.0
500	755	78	685	20	39	M36	230.0
Note: DIN 2635 specifies dimensions for Weld Neck flanges for Pressure Rating PN40. These dimensions are largely harmonized with EN 1092-1 Type 11 PN40.

BS 4504 - Flange PN16

DN (mm)	OD (mm)	Thk (mm)	PCD (mm)	No. Holes	Bolt Size	Wt (kg, Plate)
15	95	12	65	4	M12	0.8
20	105	14	75	4	M12	1.1
25	115	14	85	4	M12	1.3
32	140	14	100	4	M16	2.0
40	150	14	110	4	M16	2.3
50	165	16	125	4	M16	3.0
65	185	16	145	4	M16	3.8
80	200	18	160	8	M16	4.8
100	220	18	180	8	M16	5.6
125	250	20	210	8	M16	7.5
150	285	20	240	8	M20	9.3
200	340	22	295	8	M20	13.0
250	395	24	350	12	M20	18.5
300	445	24	400	12	M20	22.5
Note: BS 4504 was a British Standard for circular flanges, now largely superseded by EN 1092-1. The dimensions for PN16 shown here are identical to EN 1092-1 Type 01 (Plate Flange) PN16. Weights are approximate for Plate Flanges.

JIS (Japanese)

The Japanese Industrial Standards (JIS) B2220 is the primary flange standard for Japan and is frequently encountered in marine and plant engineering applications across Asia.

JIS B2220 - 5K

Nominal Size (A)	DN (mm)	OD (mm)	PCD (mm)	No. Bolts	Bolt Size
10A	10	75	55	4	M10
15A	15	80	60	4	M10
20A	20	85	65	4	M10
25A	25	95	75	4	M10
32A	32	115	90	4	M12
40A	40	120	95	4	M12
50A	50	130	105	4	M12
65A	65	155	130	4	M12
80A	80	180	145	4	M16
100A	100	200	165	8	M16
125A	125	225	190	8	M16
150A	150	250	215	8	M16
200A	200	300	265	8	M16
250A	250	355	320	12	M16
300A	300	400	365	12	M16
350A	350	445	410	12	M16
400A	400	490	455	16	M16
450A	450	545	510	16	M16
500A	500	590	555	16	M16
550A	550	640	605	20	M16
600A	600	690	655	20	M16
650A	650	755	715	20	M20
700A	700	810	770	24	M20
750A	750	860	820	24	M20
800A	800	915	875	24	M20
900A	900	1015	975	28	M20
1000A	1000	1130	1085	28	M22
1100A	1100	1230	1185	28	M22
1200A	1200	1345	1295	32	M24
1300A	1300	1445	1395	32	M24
1400A	1400	1550	1500	36	M24
1500A	1500	1655	1600	36	M24

JIS B2220 - 10K

Nominal Size (A)	DN (mm)	OD (mm)	PCD (mm)	No. Bolts	Bolt Size
10A	10	90	65	4	M12
15A	15	95	70	4	M12
20A	20	100	75	4	M12
25A	25	125	90	4	M16
32A	32	135	100	4	M16
40A	40	140	105	4	M16
50A	50	155	120	4	M16
65A	65	175	140	4	M16
80A	80	185	150	8	M16
100A	100	210	175	8	M16
125A	125	250	210	8	M20
150A	150	280	240	8	M20
200A	200	330	290	12	M20
250A	250	400	355	12	M22
300A	300	445	400	16	M22
350A	350	490	445	16	M22
400A	400	550	500	16	M24
450A	450	605	550	20	M24
500A	500	670	610	20	M27
550A	550	725	665	20	M27
600A	600	780	720	24	M27
650A	650	830	770	24	M27
700A	700	885	825	24	M27
750A	750	955	890	24	M30
800A	800	1010	940	28	M30
900A	900	1110	1040	28	M30
1000A	1000	1230	1160	28	M30
1100A	1100	1330	1255	32	M33
1200A	1200	1440	1365	32	M33
1300A	1300	1540	1465	36	M33
1400A	1400	1650	1570	36	M33
1500A	1500	1760	1680	36	M33

JIS B2220 - 16K

Nominal Size (A)	DN (mm)	OD (mm)	PCD (mm)	No. Bolts	Bolt Size
10A	10	95	70	4	M12
15A	15	100	75	4	M12
20A	20	105	80	4	M12
25A	25	130	95	4	M16
32A	32	140	105	4	M16
40A	40	145	110	4	M16
50A	50	160	125	8	M16
65A	65	180	145	8	M16
80A	80	200	160	8	M20
100A	100	225	185	8	M20
125A	125	265	220	8	M22
150A	150	295	250	12	M22
200A	200	355	310	12	M24
250A	250	430	380	16	M24
300A	300	480	430	16	M24
350A	350	540	485	16	M27
400A	400	595	540	20	M27
450A	450	655	595	20	M30
500A	500	720	655	20	M30
550A	550	780	715	24	M30
600A	600	845	775	24	M33

GOST (Russian)

GOST 12820-80 - Flat Steel Weld Flange PN6

DN (mm)	OD (D) (mm)	Thk (b) (mm)	PCD (D1) (mm)	No. Holes	Hole Dia. (d)	Bolt Size	Wt (kg)
15	80	8	55	4	11	M10	0.43
20	90	8	65	4	11	M10	0.61
25	100	9	75	4	11	M10	0.86
32	120	9	90	4	14	M12	1.28
40	130	10	100	4	14	M12	1.61
50	140	11	110	4	14	M12	1.99
65	160	11	130	4	14	M12	2.53
80	180	13	150	4	18	M16	3.67
100	200	13	170	4	18	M16	4.27
125	230	15	200	8	18	M16	6.58
150	260	15	230	8	18	M16	7.81
200	315	17	285	8	18	M16	11.08
250	370	18	340	12	18	M16	15.22
300	425	18	395	12	18	M16	18.46
Note: GOST 12820-80 covers flat (plate) steel flanges. Weights are approximate. This standard remains widely used in Russia and CIS countries.

GOST 12820-80 - Flat Steel Weld Flange PN10

DN (mm)	OD (D) (mm)	Thk (b) (mm)	PCD (D1) (mm)	No. Holes	Hole Dia. (d)	Bolt Size	Wt (kg)
15	95	10	65	4	14	M12	0.81
20	105	12	75	4	14	M12	1.21
25	115	12	85	4	14	M12	1.49
32	135	14	100	4	18	M16	2.29
40	145	15	110	4	18	M16	2.78
50	160	15	125	4	18	M16	3.35
65	180	17	145	4	18	M16	4.43
80	195	19	160	4	18	M16	5.47
100	215	19	180	8	18	M16	6.34
125	245	21	210	8	18	M16	8.56
150	280	21	240	8	22	M20	10.6
200	335	23	295	8	22	M20	14.8
250	390	25	350	12	22	M20	20.8
300	440	25	400	12	22	M20	25.5

GOST 12821-80 - Butt Weld Flange PN16

DN (mm)	OD (D) (mm)	Thk (b) (mm)	PCD (D1) (mm)	No. Holes	Hole Dia. (d)	Bolt Size	Wt (kg)
15	95	12	65	4	14	M12	0.93
20	105	14	75	4	14	M12	1.34
25	115	16	85	4	14	M12	1.75
32	135	18	100	4	18	M16	2.62
40	145	18	110	4	18	M16	3.06
50	160	18	125	4	18	M16	3.78
65	180	20	145	4	18	M16	4.88
80	195	22	160	4	18	M16	6.01
100	215	24	180	8	18	M16	7.46
125	245	26	210	8	18	M16	9.65
150	280	26	240	8	22	M20	12.3
200	335	28	295	12	22	M20	17.9
250	405	30	355	12	26	M24	26.7
300	460	32	410	12	26	M24	35.5
Note: GOST 12821-80 covers butt-weld (weld neck) flanges. The dimensions often align with European standards but have unique characteristics. Weights are approximate.

GOST 12821-80 - Butt Weld Flange PN40

DN (mm)	OD (D) (mm)	Thk (b) (mm)	PCD (D1) (mm)	No. Holes	Hole Dia. (d)	Bolt Size	Wt (kg)
15	95	16	65	4	14	M12	1.22
20	105	18	75	4	14	M12	1.68
25	115	18	85	4	14	M12	2.03
32	135	20	100	4	18	M16	2.93
40	145	22	110	4	18	M16	3.62
50	160	24	125	4	18	M16	4.64
65	180	26	145	4	18	M16	5.98
80	195	28	160	8	18	M16	7.48
100	230	30	190	8	22	M20	10.4
125	270	34	220	8	26	M24	16.0
150	300	38	250	8	26	M24	20.6
200	360	44	310	12	26	M24	33.0
250	425	50	370	12	30	M27	50.4
300	485	56	430	12	30	M27	72.5

GB / HG (Chinese)

GB/T 9119 - Plate Flange PN16 (China National Standard)

DN (mm)	OD (D) (mm)	Thk (c) (mm)	PCD (K) (mm)	No. Holes	Hole Dia. (L)	Bolt Size	Wt (kg)
15	95	14	65	4	14	M12	0.9
20	105	16	75	4	14	M12	1.2
25	115	16	85	4	14	M12	1.5
32	140	16	100	4	18	M16	2.2
40	150	16	110	4	18	M16	2.5
50	165	18	125	4	18	M16	3.4
65	185	18	145	8	18	M16	4.4
80	200	20	160	8	18	M16	5.4
100	220	20	180	8	18	M16	6.2
125	250	22	210	8	18	M16	8.1
150	285	22	240	8	22	M20	9.9
200	340	24	295	12	22	M20	14.2
250	405	26	355	12	26	M24	21.4
300	460	28	410	12	26	M24	28.2
Note: GB/T 9119 is the Chinese national standard for slip-on plate flanges. The dimensions for PN16 are largely harmonized with EN 1092-1 Type 01 PN16.

HG/T 20592 - Plate Flange PN16 (China Chemical Industry Standard)

DN (mm)	OD (D) (mm)	Thk (c) (mm)	PCD (k) (mm)	No. Holes	Hole Dia. (d2)	Bolt Size	Wt (kg)
15	95	14	65	4	14	M12	0.9
20	105	16	75	4	14	M12	1.2
25	115	16	85	4	14	M12	1.5
40	150	16	110	4	18	M16	2.5
50	165	18	125	4	18	M16	3.4
65	185	18	145	8	18	M16	4.4
80	200	20	160	8	18	M16	5.4
100	220	20	180	8	18	M16	6.2
150	285	22	240	8	22	M20	9.9
200	340	24	295	12	22	M20	14.2
300	460	28	410	12	26	M24	28.2
Note: HG/T 20592 is the Chinese standard for steel pipe flanges used in the chemical industry. The dimensions for PN16 Plate Flanges (PL) are shown here and are virtually identical to GB/T 9119 and EN 1092-1 Type 01.

HG/T 20592 - Weld Neck Flange PN40 (China Chemical Industry Standard)

DN (mm)	OD (D) (mm)	Thk (c) (mm)	PCD (k) (mm)	No. Holes	Hole Dia. (d2)	Bolt Size	Wt (kg)
15	95	16	65	4	14	M12	1.3
20	105	18	75	4	14	M12	1.7
25	115	18	85	4	14	M12	2.0
40	150	22	110	4	18	M16	3.4
50	165	24	125	4	18	M16	4.6
80	200	28	160	8	18	M16	7.6
100	235	30	190	8	22	M20	10.7
150	300	38	250	8	26	M24	20.3
200	375	44	320	12	30	M27	36.5
Note: HG/T 20592 Weld Neck (WN) flanges for PN40 are shown. These dimensions are harmonized with EN 1092-1 Type 11 PN40.

AS (Australian)

Standards Australia provides two primary flange standards, AS 2129 and AS/NZS 4087, which are essential for projects in Australia and New Zealand. AS 2129 is based on older British standards.

AS 2129 - Table D

DN (mm)	OD (mm)	PCD (mm)	No. Bolts	Bolt Size (in)
15	89	60	4	1/2
20	98	69	4	1/2
25	108	79	4	1/2
32	117	89	4	1/2
40	127	98	4	1/2
50	140	108	4	1/2
65	165	133	4	5/8
80	184	146	4	5/8
100	216	178	4	5/8
125	241	203	8	5/8
150	267	229	8	5/8
200	318	279	8	3/4
225	356	311	8	3/4
250	381	337	8	3/4
300	432	387	12	3/4
350	495	445	12	3/4
400	546	495	12	7/8
450	597	546	12	7/8
500	648	597	16	7/8
600	762	705	16	1
700	889	826	20	1
750	940	876	20	1
800	991	927	20	1
900	1092	1029	24	1
1000	1219	1156	24	1
1050	1270	1207	24	1
1200	1422	1359	28	1

AS 2129 - Table E

DN (mm)	OD (mm)	PCD (mm)	No. Bolts	Bolt Size (in)
15	95	67	4	1/2
20	102	73	4	1/2
25	114	83	4	5/8
32	127	92	4	5/8
40	140	102	4	5/8
50	152	114	4	5/8
65	178	133	4	5/8
80	191	146	4	3/4
100	216	172	8	3/4
125	241	197	8	3/4
150	279	235	8	7/8
200	330	286	8	7/8
225	368	318	8	1
250	394	343	12	1
300	445	394	12	1
350	508	451	12	1 1/8
400	559	502	12	1 1/8
450	610	552	16	1 1/8
500	673	610	16	1 1/4
600	775	711	20	1 1/4
700	902	826	20	1 3/8
750	953	876	20	1 3/8
800	1016	933	20	1 1/2
900	1118	1035	24	1 1/2
1000	1245	1156	24	1 5/8
1050	1295	1207	28	1 5/8
1200	1448	1359	28	1 3/4

The Golden Rules of Flange Selection

After reviewing this exhaustive data, the selection process can be distilled into three non-negotiable rules. Ignoring these is the single most common source of project delays and procurement errors.

ARCHIVIST'S DECREE: The Three Pillars of Certainty

IDENTIFY the System Standard First. Before you even look at a flange, you must know the governing standard of the pipeline or equipment it will connect to. Is it an ASME Class 150 system or an EN PN10 system? This is the absolute first step.
CONFIRM the Mating Flange. You are not buying a flange in isolation. You are buying one half of a matched pair. Before ordering, you must have documented confirmation of the exact standard, size, and pressure rating of the flange it will connect to. "It looks like a 10-inch 150-pound flange" is not an acceptable engineering statement.
VALIDATE with Certified Drawings. This library is the ultimate reference, but it is not a substitute for the manufacturer's certified dimensional drawing for the *specific product you are buying*. Use these charts for planning, quoting, and preliminary design. Always obtain and verify the certified drawing from the manufacturer before any fabrication or final purchase order. This is your final quality gate.

DN	OD (mm)	PCD (mm)	No. Bolts	Thread
10	105	75	4	M12
15	115	85	4	M14
20	130	95	4	M16
25	140	105	4	M16
32	155	115	4	M20
40	170	125	4	M20
50	180	140	4	M20
65	205	160	8	M20
80	230	180	8	M24
100	250	200	8	M24
125	300	245	8	M27
150	335	270	8	M30
200	395	330	12	M30
250	470	400	12	M33
300	530	460	16	M33
350	610	530	16	M36
400	670	590	16	M39
500	795	705	20	M42
600	935	840	20	M48

DN	OD (mm)	PCD (mm)	No. Bolts	Thread
10	105	75	4	M12
15	115	85	4	M14
20	130	95	4	M16
25	140	105	4	M16
32	155	115	4	M20
40	170	125	4	M20
50	195	150	4	M24
65	220	170	8	M24
80	230	180	8	M24
100	265	210	8	M27
125	315	255	8	M30
150	355	290	8	M33
200	430	360	12	M36
250	505	430	12	M39
300	585	500	12	M45
350	655	565	16	M45
400	720	625	16	M48
500	850	750	20	M52
600	985	870	20	M56

DN	OD (mm)	PCD (mm)	No. Bolts	Thread
10	105	75	4	M12
15	115	85	4	M14
20	130	95	4	M16
25	140	105	4	M16
32	155	115	4	M20
40	170	125	4	M20
50	180	140	4	M20
65	205	160	8	M20
80	230	180	8	M24
100	250	200	8	M24
125	300	245	8	M27
150	335	270	8	M30
200	395	330	12	M30
250	470	400	12	M33
300	530	460	16	M33
350	610	530	16	M36
400	670	590	16	M39
500	795	705	20	M42
600	935	840	20	M48

DN	OD (mm)	PCD (mm)	No. Bolts	Thread
10	105	75	4	M12
15	115	85	4	M14
20	130	95	4	M16
25	140	105	4	M16
32	155	115	4	M20
40	170	125	4	M20
50	195	150	4	M24
65	220	170	8	M24
80	230	180	8	M24
100	265	210	8	M27
125	315	255	8	M30
150	355	290	8	M33
200	430	360	12	M36
250	505	430	12	M39
300	585	500	12	M45
350	655	565	16	M45
400	720	625	16	M48
500	850	750	20	M52
600	985	870	20	M56

The Definitive Digital Lexicon of Global Flange Standards